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E. H. MUMFORD, DECD.

R. S. MUMFOHD. EXECUTRIX.

IVIOLDING MACHINE.

APPLICATION FILED JUNI-111.1915.-

Patented June 10, 1919 2 sHEET'vsHEETl E. H. MUMFOHD, 'DECD.

n'. s. Mu'Mrono. Execumx.

MOLDING MACHINE.

APPLICATION man JUNE u. ma.

'l ,306,075 Patented June 10, 1919.

2y SHEETS-SHEET 2.

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EDGAR H. ivrUivrroRD,

DECEASED, LATE OF PLAINFIELD, NEW JERSEY, BY ROSE S.

MUMFORD, EXECUTRIX, OF PLAINFIELD, NEW JERSEY.

Momma-MACHINE.

Specification of Letters Patent.

Patented June 10, 1919.

Application led June 17, 1915. Serial No. 34,709.

To all whom t may concern:

Be it known that EDGAR H. MUMFORD, deceased, late a citizen of the United States, residing at Plainfield, in the county of Union and State of New Jersey, did invent certain new and useful Improvements in Molding- Machines, of which the following is a specification.

This invention relates to molding machines, and it has for one of its primary objects the provision of a combined squeeze and jolt ramming molding machine of novel and simple construction. Y Another of the chief objects of his invention is the provision of novel mechanism whereby Well known types of squeezer molding machines, such for example as the Mumford squeezer machine, may be readily and inexpensively transformed into a combined squeeze and jolt ramming machine.

The foregoing, together with such other objects as may hereinafter appear or are incident to the invention, he attains by means of a construction which he has illustrated in preferred form in the accompanying drawings, wherein:

Figure 1 is a perspective View of a squeeze machine of the Mumford type; Fig. 2 is an enlarged partial section of one form of valve mechanism employed in carrying out the invention; Figs. 3 and 4 are respectively a plan and sectional view of a detail of the improvement; and Fig. 5 is an enlarged sectional view of a squeezer molding machine of the type described, as transformed into a combined squeeze and jolt ramming machine by the introduction of the .improved attachment.

The machine shown in Fig. 1 of the drawings is substantially the same as that shown in Fig. 6 of U. S. Letters Patent No. 932,563, issued to Edgar H. Mumford on August 31, 1909, and briefly considered, comprises a base A on which is swingingly mounted the squeeze yoke B. At the top, the base A is providedwith a plane flange portionl or seat 7 to which the cylinder 8 is secured by means of the bolts 9. On'the top of the cylinder 8 is a supporting frame 10 which carriesA the pattern carrier mechanism C upon which the pattern is attached, the elevating frame D upon which the flask or mold rests, and by the movement of which the mold is freed from the pattern, and the fluid plunger mechanism 6 by means of which the frame D is elevated, as set forth in Letters Patent of the United States, No. 846,685, issued to Edgar H. Mumford on March 12, 1907. This type of machine is known as a squeezer in which the ramming or squeezing of the mold is effected by advancing the mold parts toward and pressing themagainst the platen 11 of the ramming yoke.

This machine has gone into extensive use, and as previously indicated, one of the chief objects of the present invention is the provision of novel and simple means whereby this machine may be effectively transformed into a combined squeeze and jolt ramming machine whereby the machine may be used in carrying out jolt ramming operations without in the least impairing its functions and operation in carrying out a squeezing molding operation.

The foregoing is accomplished by interposing between the parts of the machine just described certain elements which are shown in section in Fig. 5 in assembled relation. In changing over the machine, the frame 10 and its associated parts are detached from the cylinder 8, and the cylinder 8 is detached from the base A by removing the y.bolts 9. A base plate 12 which is provided with an upstanding post or stationaryplunger 13 is then mounted upon the flange portion 7. The cylinder 8 is superimposed u-pon the base 12 and these parts are' secured to the base A by means of the bolts 14, the plate 12 forming the bottom of the cylinder. A hollow plunger 15 is provided which fits the bore of the cylinder '8 and which has a centrally disposed cylindrical portion 16 which fits the post 13. The plunger 15 is flanged at the top and the frame 10 of the squeeze machine to be transformed is secured thereto, an open joint being provided between the parts by means of the bo-sses 16. Resting in the bottom of the cylinder beneath the lower face of the plunger 15 is a combined impact and valve member E such as shown and described in the Letters Patent issued t0 Edgar H. Mumford, No. 1,151,213, August 24th, 1915. In the bottom of the vplunger are a plurality of surge ports 17 the purpose of which will hereinafter appear. Fluid pressure is introduced into the cylinder 8 beneath the member E by means of a pipe 18, the supply of pressure being governed by any suitable fol'm of valve mechanism, not shown.

' ramming operations of thepmachine, and

the parts and" ".,their operation are the same as those shown in Letters Patent No. 1,171,869, issued to Edgarl H. Mumford Feb. 15, 1916. For the purposes of this specification, it will be suflicient to state that theoperation of the machine as a jolt rammer is as follows:

Fluid pressure is introduced into the chamber 19 through the pipe 20 and passes into the lcylindrical portion 16 via the port 24 and passage 23, raising the cylindrical portion 16 and the plunger 15 of which the cylindrical portion 16 forms a part, and thereby elevates the frame 10 and its associated parts. During this movement, the

' valve 25 remains in open position. When the port 26 formed in the lwall of the cylindrical portion 16 is uncovered by upward movement of the cylindrical portion 16, and the. discharge end of the passage 23 is covered by the wall of the cylindrical portion 16, the pressure in the cylinder eX- hausts through the port 26 and out through the open joint'between the plunger 15 and the frame 10. As a result of the sudden reduction of pressure in the cylinder which occurs upon the exhaust of fluid pressure in the chamber above the post through the port 26, the valve 25 moves upwardly, thereby cutting olf the supply of fluid pressure. The 'parts then falli and the plunger 15 impacts onv the ymember E, thus jolting the mold. As the parts approach lower position, the tappet 27 in the top of the cylindrical portion 16 strikes the stem of the valve 25 and moves the latter to open position, thereby again admitting pressure into the cylinder. The operation automatically repeats itself until the supply of pressure to the pipe 20 is manually cut 0H. v

lVhen the machine is being operated as a squeezer, pressure is admitted through the pipe 18 into the bottom of the cylinder 8 and raises the member E and the plunger 15 and its associated parts, thereby advancing the mold toward ythe platen of the yoke. It will be obvious that when the machine is being 'used to carry'on a jolt ramming operation, there will' be a tendency to draw a vacuum in the bottom of the cylinder 8 and to meet this difficulty, and to cause the flows lfreely through the port 17 because machine to operate smoothly and effectively, he has provided the surge ports 17 which permit the air to circulate freely in-` the cylinder during such operation. The air the member E during the jolt ramming operation lies in the bottom of the cylinder 8. Vhenever the machine is used in carrying out a squeezing operation, the pressure introduced into the cvlinder 8 beneath the member E holds Vthe latter in engagement 'with `the bottom face ofthe plunger 15, thereby closing the 'surge ports 17. The member E therefore acts as a valve menr ber during the 'squeezing operation and as an impact member receiving the impact of the plunger during a jolt ramming operation.

yIt 'will be seen fronrthe foregoing that a standard squeezer machine can kbe simply and inexpensively transformed into a combined squeeze and joltlrammingmachine, and that when thus transformed, either a squeezing operation or a jolt ramming operation ean be effectively carried on. The improvement is simple in construction and eflicient in operation, and lends itself readily to adaptation to standard types of squeezer machines. It is inexpensive and effective in operation. n

Claims: Y

1. An attachment for changing a squeezer molding machine having a base andI a squeezer cylinder into a combined jolt and squeeze ramming molding machine, com- 100 prising a member adapted to bey mounted on the 'base between the cylinderand the base, saidmember being provided with an upstanding post, a plunger member adapted to lit said squeezer cy-linder'and provided 105 with a Vcylindrical portion adapted to fit said post, and means for introducing fluid pressure under the plunger member for a 'squeeze operation'and between the plunger member and the upstanding post for a jolt operation. v

2. An attachment for changing a squeezer molding machine having a base and a vsqueezer cylinder into a combined joltl and squeeze ramming molding machine, com'- 115 prising a cylindrical post member adapted to be carried on the base within the squeezer cylinder, a plunger adapted to-t said cylinder and having a cylindrical portion adapted to nt said post, and means for in 120 troducing flui'dpressure under the plunger member for a squeezing operation and between the plunger member and the upstanding post for `a jolting operation.- 3. Air-attachment for kchanging a squeezer molding machine having a base and a squeezer cylinder into a combined jolt and squeeze ramming machine, comprising a cylindrical post member adapted to be 'carried on the base within the cylinder, a 130 plunger adapted to t said cylinder and having a cylindrical portion adapted to fit said post, valve mechanism between said post and said cylindrical portion, and means for introducing fluid pressure under the plunger member for a squeezing operation and between the plunger member and the upstanding post for a jolting operation, said Valve mechanism controlling the fluid pressure introduced between the plunger 10 member and the upstanding post.

ln testimony whereof I have hereunto signed my name.

ROSE S. MUMFORD, Eweeutm'm of the estate of E gar H. Mumford, deceased. Vitness:

ARTHUR E. CRONE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

